Tanzania is entering a new phase in its energy story as the 2,115-megawatt Julius Nyerere Hydropower Plant moves from mega-project to economic infrastructure, promising to reshape the country’s electricity supply while testing whether billions of dollars in public investment can deliver the industrial growth officials have long promised.
The plant on the Rufiji River has been one of East Africa’s most ambitious infrastructure projects, carrying a price tag of about $2.9 billion and involving an Egyptian construction consortium. The project is owned by Tanzania Electric Supply Company, or TANESCO, and was financed by the Tanzanian government rather than through a conventional private project-finance structure.
That makes the Julius Nyerere project more than a power station.
It is a bet by the Tanzanian state on electricity, industrialisation and national economic transformation.
And it raises a question that goes beyond the turbines: who really wins?
A project decades in the making
The idea of harnessing the Rufiji River for large-scale power generation is not new.
Plans for a dam in the area date back decades. The modern Julius Nyerere project emerged as a flagship priority under the late President John Magufuli and was subsequently carried forward by President Samia Suluhu Hassan.
In December 2018, TANESCO signed an engineering, procurement, construction and commissioning contract with a joint venture between Egypt’s Arab Contractors and Elsewedy Electric. Construction officially began in June 2019.
The project was designed around nine generating units with a combined installed capacity of 2,115 MW and expected annual generation of about 6,307 gigawatt-hours.
For a country whose power system has historically depended heavily on natural gas and hydropower, that is a substantial addition.
It is also a strategic one.
The World Bank has identified growing electricity demand and energy security as major challenges for Tanzania. As of June 2024, Tanzania had about 2,411 MW of total installed generation capacity, while natural gas accounted for roughly 63% of main-grid generation and hydropower about 32%.
The Julius Nyerere plant therefore represents a major change in the scale of Tanzania’s hydroelectric ambitions.
Who paid for it?
This is where the project becomes particularly interesting from a power-and-money perspective.
Unlike many African infrastructure projects financed through a consortium of development banks, export-credit agencies and private investors, the Julius Nyerere project has been funded by the Tanzanian government.
Tanzania’s National Audit Office reported the project cost at about 6.56 trillion Tanzanian shillings and said it was fully funded by the government. The audit also found that the project had experienced delays, with the original completion date extended and the project still undergoing contract and completion issues during the 2023/24 audit period.
That distinction matters.
The financial risk ultimately sits with the state.
If the plant generates reliable electricity for decades, Tanzania could benefit from an important piece of long-term economic infrastructure. If electricity demand, tariffs or industrial consumption fail to rise sufficiently, however, the government still carries the burden of having committed a huge amount of public money to the project.
The financial question is therefore not simply whether the dam was expensive.
It is whether Tanzania can generate enough economic value from the electricity to justify the investment.
Egypt’s strategic role
The other major winner from the project is Egypt’s construction industry.
The Arab Contractors, a large Egyptian state-owned construction company, and Elsewedy Electric were awarded the contract following an international tender. The project was valued at approximately $2.9 billion.
The relationship is significant beyond the construction site.
Cairo has repeatedly described the project as an important symbol of Egyptian-Tanzanian cooperation, while Egyptian officials have closely followed its implementation.
For Egypt, the project demonstrates the ability of its engineering and construction companies to compete for major infrastructure contracts on the continent.
For Tanzania, it provides access to foreign engineering expertise while strengthening economic ties with one of Africa’s largest economies.
This is the quieter side of infrastructure diplomacy.
Large projects create commercial relationships that can last long after the concrete has been poured.
The Julius Nyerere project could therefore open the door to further Egyptian participation in Tanzania’s infrastructure, energy and construction markets.
The real prize is industrialisation
For Tanzania, however, the turbines are not the final objective.
The real prize is productivity.
Cheap and reliable electricity can reduce operating costs for factories, mines, processing plants, commercial buildings and other businesses. It can also make investment decisions easier for companies that require predictable power.
That is particularly important for Tanzania as it attempts to move from an economy heavily dependent on agriculture, mining and services towards greater industrial and manufacturing activity.
A modern factory cannot operate efficiently if power interruptions repeatedly stop production.
A mineral processor cannot compete internationally if electricity costs are too high.
A cold-storage facility cannot protect food supplies without dependable electricity.
And digital businesses need stable power to run data centres, telecommunications equipment and other infrastructure.
The Julius Nyerere plant can therefore become an economic multiplier.
But only if Tanzania builds the systems around it.
The grid is the next test
Producing electricity is one thing.
Delivering it to customers is another.
The project includes a 400-kilovolt transmission connection intended to integrate its output into the national grid.
That infrastructure is critical because the value of a power plant ultimately depends on whether electricity reaches factories, businesses and households at the right price and with sufficient reliability.
Tanzania has been expanding its electricity network rapidly, but access remains uneven.
A World Bank assessment put electricity access at about 48.3% in 2023, with a significant gap between urban and rural areas. The government has set much higher connectivity targets for the coming years.
That creates two different markets for Julius Nyerere.
The first is industrial Tanzania, where additional electricity can support production and investment.
The second is households and communities that still need reliable access to the grid.
The political challenge will be balancing those demands.
Can cheap power become cheap electricity?
This is perhaps the most important question for Tanzanian consumers.
Large-scale hydropower can provide electricity at relatively low operating costs once construction is complete because the fuel itself is water.
But low generation costs do not automatically translate into low retail electricity prices.
Tanzania still needs to pay for transmission networks, distribution infrastructure, maintenance, system management and other components of the electricity supply chain.
TANESCO must also maintain a financially sustainable utility.
The plant will therefore not magically eliminate all electricity costs.
Its larger contribution could be to improve the overall reliability and diversity of Tanzania’s power system.
That matters because Tanzania has also faced the risks associated with drought.
The World Bank has warned that energy security remains vulnerable to recurring droughts, even as the country expands electricity infrastructure.
This is the paradox at the heart of Tanzania’s hydroelectric bet.
Water is a cheap fuel when rivers and reservoirs are full.
But climate variability can turn hydropower into a vulnerability if the electricity system becomes too dependent on rainfall.
A giant reservoir with a complicated legacy
The project also carries an environmental controversy that Tanzania cannot easily separate from its economic ambitions.
The dam sits within the wider Selous ecosystem, one of Africa’s most important wildlife landscapes.
UNESCO has repeatedly raised concerns about the impact of the Julius Nyerere project on the outstanding universal value of the Selous Game Reserve, which remains on the List of World Heritage in Danger. In its 2025 decision, UNESCO noted that all nine turbines had become operational in April 2025 and expressed concern over the irreversible effects of the project on the property.
The concern is not simply about the dam wall.
Large reservoirs alter river systems.
They can change downstream water flows, affect wetlands and fisheries, influence wildlife movements and reshape human activity around the river.
The Tanzanian government has argued that the project can also deliver benefits beyond electricity, including flood control, irrigation and regulated water flows. TANESCO lists electricity generation, flood control and environmental water management among the plant’s objectives.
The debate is therefore not easily reduced to development versus conservation.
The more difficult question is whether Tanzania can prove that the economic benefits of the dam can coexist with responsible management of the Rufiji ecosystem.
The audit question
Every mega-project eventually reaches the same test: what did it actually cost?
Tanzania’s National Audit Office has raised concerns about the management of the Julius Nyerere contract.
One audit found that the contractor had submitted a claim for price adjustments amounting to 1.14 trillion Tanzanian shillings. The audit said the contract lacked specific provisions governing price adjustments when the completion date was extended, contributing to a dispute that was ultimately decided in favour of the contractor.
For taxpayers, this is an important part of the story.
The headline figure of $2.9 billion tells only part of the financial picture.
The eventual economic cost also depends on delays, financing costs, contract adjustments, transmission investments and the additional infrastructure required to distribute the power.
That does not necessarily mean the project will fail financially.
It means the return on the investment needs to be measured over decades rather than at the inauguration ceremony.
Who benefits?
The first beneficiary is the Tanzanian state.
It now controls a major strategic electricity asset capable of transforming the national generation mix.
Businesses are another obvious beneficiary if the new supply improves reliability and keeps electricity costs competitive.
Industries that use large amounts of electricity could be particularly important.
Mining operations, cement manufacturers, steel producers, food processors and other energy-intensive businesses could expand production if dependable electricity becomes available.
Households could also benefit if improved generation reduces power shortages and supports wider grid expansion.
And then there is the broader economy.
More reliable electricity can support investment, jobs, tax revenues and exports.
But there is a caveat.
Electricity does not create industrialisation on its own.
Factories still need roads, ports, railways, finance, skilled workers, predictable regulation and access to markets.
That means Julius Nyerere is best understood as a foundation rather than a finished industrial strategy.
The East African angle
The implications also extend beyond Tanzania.
East Africa is gradually building a more interconnected electricity market, with countries seeking to trade power across borders and reduce dependence on expensive emergency generation.
Tanzania’s strategic position gives it an opportunity to become a more important electricity player in the region.
A large and reliable generation base could support future power exports if transmission interconnections and commercial arrangements develop sufficiently.
The World Bank has described regional interconnection as important to Tanzania’s long-term electricity strategy and noted the country’s position within the Eastern Africa Power Pool.
That could eventually turn Tanzania from an electricity importer in certain circumstances into a stronger regional supplier.
But again, transmission capacity will determine how much of that potential becomes reality.
The political dividend
There is also a domestic political dimension.
Infrastructure projects of this size are visible symbols of state capacity.
For President Samia Suluhu Hassan’s government, the Julius Nyerere plant can be presented as evidence that Tanzania can execute infrastructure projects capable of changing the structure of the economy.
The project also carries the name of Julius Nyerere, Tanzania’s founding president, adding a layer of historical symbolism.
The message is powerful: a development idea conceived generations ago has finally become a functioning national asset.
But symbolism has a short shelf life.
Tanzanians will ultimately judge the project through practical outcomes.
Are power cuts reduced?
Does electricity become more reliable?
Do factories expand?
Do investors arrive?
Are jobs created?
Does economic activity spread beyond Dar es Salaam?
And does the government recover sufficient value from the investment to justify the enormous public expenditure?
Those are the measures that will determine the project’s real legacy.
The $3 billion question
The Julius Nyerere Hydropower Plant is already a landmark.
At 2,115 MW, it is one of Africa’s major hydropower installations and a defining piece of Tanzania’s infrastructure strategy. Its nine generating units are now operational, according to the latest project and UNESCO reporting.
But the biggest story begins after construction.
Tanzania has spent years building the dam.
Now it must build an economy capable of making full use of it.
That means expanding transmission, strengthening distribution, attracting energy-intensive industries, improving the business environment and ensuring that electricity reaches productive users rather than simply adding capacity to the national system.
It also means managing the environmental costs of development more carefully, particularly given UNESCO’s continuing concerns about the Rufiji ecosystem.
For Egypt, the project is a showcase for African infrastructure ambitions.
For Tanzania, it is a national economic wager.
For investors, it is a signal that the country intends to build the energy base required for industrial growth.
And for ordinary Tanzanians, its success will ultimately be measured in a much simpler currency: whether the lights stay on and whether the electricity helps create better jobs and a more productive economy.
The dam may have been built on the Rufiji.
But its real value will be decided in Tanzania’s factories, mines, farms, businesses and homes.
That is where the $3 billion bet either pays off or falls short.
Editorial note: Reporting and analysis are based on Tanzanian government, TANESCO, National Audit Office, World Bank, UNESCO and project-contractor sources. The plant was already reported as fully operational in 2025, so this feature treats the current moment as the transition from construction to economic impact rather than describing the plant as merely about to begin operating.
